From 2D → 3D interpenetration to packing: N coligand-driven structural assembly and tuning of luminescent sensing activities towards Fe³⁺ and Cr₂O₇²⁻ ions

Abstract

Three new luminescent transition coordination polymers, namely, {[Cd(L)(4,4-bpy)]·DMF·H2O}n (1), {[Cd2(L)2(bpe)2]·3DMF·2.5H2O}n (2), and {[Cd(L)(bibp)]·2DMF}n (3), (H2L = 4,4'-[benzene-1,3-diylbis(methanediylsulfanediyl)]dibenzoic acid, 4,4-bpy = 4,4-bipyridine, bpe = 1,2-bis(4-pyridyl)ethylene, and bibp = 4,4'-bis(benzoimidazo-1-ly)biphenyl), were solvothermally synthesized using Cd2+ ions and S-containing dicarboxylate acid in the presence of different N coligands. These complexes were fully characterized via elemental analysis, infrared spectroscopy (IR), single crystal X-ray diffraction analysis, and thermal gravimetric analysis (TGA). Complexes 1-3 consist of 2-D structures through the connectivity of similar 1-D Cd-L chains by different N coligands. With an increase in the size of the N coligands, these complexes show structural changes from 2D → 3D with 3-fold interpenetration of complexes 1 and 2 to the 2-D packing modes of complex 3. The luminescence properties of these three complexes were studied in detail. The results reveal that each complex exhibits selectivity and sensitivity towards Fe3+ and Cr2O72- ions, and complex 2 demonstrates the lowest detection limit towards both ions.

Selective detection of trinitrophenol by a Cd(ii)-based coordination compound

“…The chemistry of such materials is of great interest to synthetic chemists because of their intriguing structural motifs as well as potential applications in areas such as catalysis, magnetism, ion exchange, drug delivery, conductance, photoluminescence and chemical sensing. [4][5][6][7][8][9][10][11][12][13][14][15] In addition to the direct role of the metal ions and organic ligands, there are many more essential conditions, including counter anions, reaction temperatures, solvent media, external stimuli, and pH of the reaction medium, which play crucial roles during compound formation. In addition, there is an eternal relationship among the structure, property and application of the compounds.…”

Cobalt(II) and silver(I) coordination polymers containing flexible bis (benzimidazol‐1‐yl)hexane ligands: synthesis, crystal structures, sensing and photocatalytic properties

“…In the Figure c, the relationship between the luminescence intensity and the concentrations of Fe 3+ ion is fit for I 0 /I = [2.37 × exp (2.9345 × 10 3 × [Fe 3+ ]) ‐ 2.31] + 1 ( R 2 = 0.9970), which indicates the quenching process controlled by the concentrations of Fe 3+ ion can be quantitative . Furthermore, a good linear correlation for ( I 0 ‐ I )/ I 0 and the concentration of Fe 3+ ion was obtained in the concentration range of 0–3 × 10 −2 M (R 2 = 0.9978, K sv = 1.0208 × 10 4 M −1 ), the detection limit of 3.30 μM was calculated, which is indicating that 1 can be used as a highly selective and sensitive luminescent probe for sensing Fe 3+ ion …”

Fabrication of a Zn(II)‐Based 2D Pillar Bilayer Metal‐Organic Framework for Antimicrobial Activity

“…Organic‐inorganic hybrid materials, also known as coordination polymers (CPs) or metal‐organic frameworks (MOFs) have been designed and produced in the form of crystals via simple synthetic procedure using metal salts and organic ligands . The potential applications of these compounds such as gas storage and separation, catalysis, electrical conductivity, sensing, magnetism, drug delivery and solar cell can be attained by varying diversity of framework structures of MOFs . Thus, the judicious choice of the metal ion and organic linker leads to the execution of desire applications or properties.…”